Shift between axis frame and ticks / image

[cdeil]

I wanted to try out wcsaxes, so I pasted the examples from the docs into a notebook (located here.
As you can see the axis frame is often shifted from the ticks and image, i.e. it doesn't work for me (wcsaxes version a44c658, matplotlib version 1.3.1).

@astrofrog Do you plan to maintain the WCSAxes Demo notebook?
If yes, could you include a command to download the example FITS files (or include them in the notebook if that is possible) so that one can start playing with wcsaxes?

cc @anizami

[jzuhone]

I had a similar issue, I tracked it down to changeset 2a6f05e, lines 109-110 of frame.py:

if self._update_cache == [xmin, xmax, ymin, ymax]:
    return
self._update_cache = [xmin, xmax, ymin, ymax]
self._sample_cache = {}

If this logic is removed, then I get the correct behavior. @cdeil can you try verifying this for what you saw? @ChrisBeaumont any ideas?

[ChrisBeaumont]

Ah interesting, I wonder if this is an issue related to how figures are rendered into the notebook. I'll investigate

[astrofrog]

@ChrisBeaumont - it looks like _sample_cache is never actually populated - is that normal?

[ChrisBeaumont]

Since this is obviously broken on the notebook, I think the short term solution is to drop the caching stuff (setting spine.data seems to have side effects, even when being set to the same value as before. But I can't figure out what they are).

[cdeil]

@ChrisBeaumont Thanks for fixing this ... wcsaxes now works in the IPython notebook: http://nbviewer.ipython.org/gist/cdeil/36243e307090c7a740ba